Tuesday morning will be fine. It would be ideal if you mounted your axle tight, it's for smooth riding and the bodies flex a lot normally so it sounds like a great idea.
6.3's have a 25mm spacer between the mount and the body, this raises the car up but the cars are set lower with the airsprings. This lowers the cars center of gravity and improves the handling a lot.
You could do the same with your car,lift the front of the body by fitting long alloy blocks and adjusting the car back down with the shorter springs.
If you replace the two flat springs in the front with adjustable rods you can alter your castor quickly and easily.